Current collecting plate for cylindrical battery

Abstract

The present invention provides a current collecting plate structure that is a current collecting plate for electrically connecting tab parts of an electrode assembly to a battery can, and comprises: a main body part; two or more tab connection parts protruding outwardly in the radial direction from the outer periphery of the main body part so that the bottom surfaces thereof are connected to the tab parts, and each having one or more alignment holes; and a can connection part protruding outwardly in the radial direction from a portion in the outer periphery of the main body part, from which the tab connection parts do not protrude, and bent upwardly so as to be connected to the battery can.

Description

current collector plates for cylindrical batteries

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0092952, dated July 15, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a current collector plate electrically connecting a battery can and an electrode assembly, and a structure of a cylindrical battery including the same.

[0003] Secondary batteries, which have high applicability according to product group and electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electrical power sources.

[0004] These secondary batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency because they not only have the primary advantage of drastically reducing the use of fossil fuels, but also have the advantage of producing no byproducts from energy use.

[0005] Currently, the types of secondary batteries widely used include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, i.e., unit battery cells, is approximately 2.5 V to 4.5 V. Therefore, when a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Furthermore, depending on the charge / discharge capacity required for the battery pack, a number of battery cells are connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack and the electrical connection type can be set in various ways depending on the required output voltage and / or charge / discharge capacity.

[0006] Meanwhile, as types of unit secondary battery cells, cylindrical, square, and pouch-shaped battery cells are known. Referring to Fig. 1, a cylindrical battery cell (BC) is configured by housing an electrode assembly in a battery can (1) made of a metal material. At this time, the battery can (1) is electrically connected to the electrode assembly, so that a portion of its surface functions as a negative or positive terminal.

[0007] Referring to Fig. 2, a cylindrical battery cell (BC) mainly includes a jelly roll type electrode assembly (2) formed by alternately stacking positive and negative plates with a separator interposed therebetween and then winding them along a central axis. On both axial sides of this electrode assembly (2), the ends of the positive and negative plates, on which no active material is applied, protrude to form tab portions (20), and each tab portion (20) is electrically connected by being connected to the battery can (1) itself or to a terminal mounted on the battery can (1).

[0008] At this time, as shown in Fig. 3, the electrode assembly (2) and the battery can (1) can be connected by a current collector plate (3) welded to a tab portion (20). Referring to Fig. 4, the current collector plate (3) usually has a tab connection portion (31) welded to the tab portion (20) of the electrode assembly (2), a can connection portion (32) connected to the battery can (1), and a body portion (30) at the center from which these each protrude.

[0009] Referring to Fig. 5, the current collector plate (3) has a plurality of alignment holes (H) arranged along the circumferential direction inside the main body (30) so as to be accurately aligned with the electrode assembly (2). An alignment bar is inserted into the alignment holes (H) so that the current collector plate (3) can be welded along the welding line (WL) while being correctly aligned with respect to the electrode assembly (2).

[0010] Meanwhile, when an alignment hole (H) is provided in the main body (30), the cross-sectional area of ​​the current path between the tab connection (31) and the can connection (32) decreases. In this case, the resistance of the current collector (3) increases, which causes a problem in that the efficiency of the battery cell (BC) decreases and heat generation increases.

[0011] In addition, since the alignment hole (H) is positioned between the main body (30) and the tab connection part (31), a problem occurs in which the welding line (WL) is blocked by the alignment hole (H) and cannot be extended long enough. In this case, there is also a problem in which the welding strength between the current collector (3) and the electrode assembly (2) is reduced and the current resistance increases.

[0012] The present invention was created under the background of the above-described prior art, and aims to provide a structure of a battery cell having increased efficiency by including a current collector plate with reduced resistance.

[0013] In addition, the present invention aims to provide a structure of a current collector plate that is prevented from twisting or bending and is easy to align with an electrode assembly.

[0014] The present invention also seeks to provide a structure of a current collector plate that can be precisely aligned with an electrode assembly and welded with high strength, and a structure of a battery cell in which the current collector plate is welded with the electrode assembly with high strength.

[0015] The technical objectives of the present invention are not limited to the aforementioned purposes. Other unmentioned objectives and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0016] In order to solve the above problem, the present invention provides a current collector plate electrically connecting a tab portion of an electrode assembly and a battery can, the current collector plate structure including: a main body portion; two or more tab connection portions that protrude radially outward from an outer periphery of the main body portion and have bottom surfaces connected to the tab portions, each having one or more alignment holes; and a can connection portion that protrudes radially outward from a portion of the outer periphery of the main body portion from which the tab connection portions do not protrude and is bent upward to be connected to the battery can.

[0017] At this time, for each of the tab connection parts, an edge part is defined that defines the radially innermost boundary of the tab connection part, a base part placed on the outer periphery of the main body part, a first edge part that defines one width-wise boundary of the tab connection part, and a second edge part that defines the other width-wise boundary of the tab connection part.

[0018] The above alignment hole is provided to align the current collector plate with respect to the electrode assembly. Specifically, according to one embodiment, an alignment bar, which is at least temporarily fixed to the electrode assembly, passes through the alignment hole, and in that state, the current collector plate and the electrode assembly are welded, so that the current collector plate can be welded in a state in which it is properly aligned with the electrode assembly.

[0019] According to one aspect of the present invention, the alignment holes are spaced apart from each of the edge portions in the width direction by a predetermined distance, and the predetermined distance is more than half the width of the base portion. Accordingly, due to the distance from the edge portion to the alignment hole, the tab connection portion can easily resist twisting and circumferential bending, and as a result, the entire collector plate can have better alignment, higher welding strength, and resistance to deformation. In addition, as the area between the edge portion and the alignment hole is secured larger, the area through which a welding line for welding the collector plate and the electrode assembly to each other can pass increases, and thus the welding strength between the collector plate and the electrode assembly can be further improved.

[0020] It is preferable that the above tab connection portions be provided in three or more. If the above tab connection portions are provided in two or fewer, the current collector plate may be easily twisted or lifted relative to the alignment bar or the electrode assembly, which may cause problems such as deformation, misalignment, or reduced welding strength.

[0021] According to one embodiment of the present invention, each of the tab connecting portions may include a section whose width increases radially outward. Furthermore, according to one embodiment of the present invention, in each of the tab connecting portions, an angle formed by the first edge portion and the second edge portion may be 0 degrees or greater. Accordingly, the alignment hole may be provided in a portion of the tab connecting portion with a relatively large width, and it is easy to secure a distance from the edge portion to the alignment hole.

[0022] According to one embodiment of the present invention, the alignment hole may be provided one at each of the tab connection portions. In this case, the alignment hole is preferably provided on the widthwise center line of the tab connection portion. This is to symmetrically form the rigidity between the first edge portion and the alignment hole and the rigidity between the second edge portion and the alignment hole, and to secure the maximum average separation distance between the two sides.

[0023] It is preferable that the width between the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion does not decrease as it goes outward in the radial direction. In addition, it is preferable that the angle formed by the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion is 0 degrees or more. Accordingly, the welding line between the collector plate and the electrode assembly can be extended long over the area extending from the base portion to between the edge portion and the alignment hole.

[0024] The present invention also provides a structure of a battery cell including: a battery can; an electrode assembly accommodated in the battery can and including a tab portion; and a current collector plate electrically connecting the battery can and the tab portion.

[0025] The above current collector plate includes: a main body; two or more tab connection portions that protrude radially outward from an outer periphery of the main body and have bottom surfaces connected to the tab portions, each having one or more alignment holes; and a can connection portion that protrudes radially outward from a portion of the outer periphery of the main body from which the tab connection portions do not protrude and is bent upward to be connected to the battery can.

[0026] At this time, for each of the tab connection parts, an edge part is defined that defines the radially innermost boundary of the tab connection part, a base part placed on the outer periphery of the main body part, a first edge part that defines one width-wise boundary of the tab connection part, and a second edge part that defines the other width-wise boundary of the tab connection part.

[0027] According to another aspect of the present invention, the tab portion and the collector plate are welded along a welding line extending in a straight line, the welding line including: a first welding line extending from the inside of the main body portion to between the alignment hole and the first edge portion; and a second welding line extending from the inside of the main body portion to between the alignment hole and the second edge portion.

[0028] According to the present invention, as the welding line extends from the inside of the main body portion through the base portion to between the edge portion and the alignment hole, the welding strength between the current collector plate and the electrode assembly can be greatly secured.

[0029] In addition, according to the present invention, since the alignment hole is provided in the tab connection portion rather than inside the main body portion, it is not placed on the current transmission path between the tab connection portion and the can connection portion, thereby providing the advantage of a large cross-sectional area of ​​the current path and a small resistance.

[0030] The above welding line may further include a third welding line extending from the inside of the main body to the radially inner side of the alignment hole. According to one embodiment of the present invention, in order for the third welding line to extend to a sufficient length, it is important that a sufficient radial distance be secured between the alignment hole and the base portion.

[0031] The above alignment hole is provided to align the current collector plate with respect to the electrode assembly. Specifically, according to one embodiment, an alignment bar, which is at least temporarily fixed to the electrode assembly, passes through the alignment hole, and in that state, the current collector plate and the electrode assembly are welded, so that the current collector plate can be welded in a state in which it is properly aligned with the electrode assembly.

[0032] According to one embodiment of the present invention, the alignment holes are spaced apart from each of the edge portions in the width direction by a predetermined distance, and the predetermined distance may be more than half the width of the base portion. Accordingly, due to the distance from the edge portion to the alignment hole, the tab connection portion can easily resist twisting and circumferential bending, and as a result, the entire collector plate can have better alignment, higher welding strength, and resistance to deformation. In addition, as the area between the edge portion and the alignment hole is secured larger, the area through which a welding line for welding the collector plate and the electrode assembly to each other can pass increases, and thus the welding strength between the collector plate and the electrode assembly can be further improved.

[0033] It is preferable that the above tab connection portions be provided in three or more. If the above tab connection portions are provided in two or fewer, the current collector plate may be easily twisted or lifted relative to the alignment bar or the electrode assembly, which may cause problems such as deformation, misalignment, or reduced welding strength.

[0034] According to one embodiment of the present invention, each of the tab connecting portions may include a section whose width increases radially outward. Furthermore, according to one embodiment of the present invention, in each of the tab connecting portions, an angle formed by the first edge portion and the second edge portion may be 0 degrees or greater. Accordingly, the alignment hole may be provided in a portion of the tab connecting portion with a relatively large width, and it is easy to secure a distance from the edge portion to the alignment hole.

[0035] According to one embodiment of the present invention, the alignment hole may be provided one at each of the tab connection portions. In this case, the alignment hole is preferably provided on the widthwise center line of the tab connection portion. This is to symmetrically form the rigidity between the first edge portion and the alignment hole and the rigidity between the second edge portion and the alignment hole, and to secure the maximum average separation distance between the two sides.

[0036] It is preferable that the width between the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion does not decrease as it goes outward in the radial direction. In addition, it is preferable that the angle formed by the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion is 0 degrees or more. Accordingly, the welding line between the collector plate and the electrode assembly can be extended long over the area extending from the base portion to between the edge portion and the alignment hole.

[0037] The present invention can provide a current collector plate having a low resistance in a current path and a structure of a battery cell having increased efficiency by including the same.

[0038] In addition, the present invention can provide a structure of a current collector plate that is prevented from twisting or bending and is easy to align with an electrode assembly.

[0039] The present invention can also provide a structure of a current collector plate that can be precisely aligned with an electrode assembly and welded with high strength, and a structure of a battery cell in which the current collector plate is welded with the electrode assembly with high strength.

[0040] In addition, the present invention may have various other effects, which will be described in each embodiment, or the description of effects that can be easily inferred by a person skilled in the art will be omitted.

[0041] Figure 1 shows a cylindrical battery cell.

[0042] Figure 2 shows a jelly roll type electrode assembly.

[0043] Figure 3 shows an enlarged cross-section of the battery cell of Figure 1.

[0044] Fig. 4 shows a current collector included in the battery cell of Fig. 3.

[0045] Figure 5 shows the current collector of Figure 4 connected to the electrode assembly of Figure 2.

[0046] Figure 6 illustrates a battery cell according to one embodiment.

[0047] Figure 7 illustrates an electrode assembly according to one embodiment.

[0048] Figures 8 and 9 illustrate a current collector plate according to one embodiment.

[0049] Figure 10 shows an enlarged cross-section of a battery cell according to one embodiment.

[0050] Figures 11 and 12 show the positional relationship of alignment holes for the main body and tab connection portion of the collector plate according to one embodiment.

[0051] [Revised 15.09.2025 under Rule 91] Fig. 13 shows a current collector plate welded to an electrode assembly according to one embodiment.

[0052] [Explanation of symbols]

[0053] 1: Battery can 10: Crimping part 2: Electrode assembly 20: Tab part 3: Collector plate 30: Body part 31: Tab connection part 311: Base part 312: Tip part 313: Edge part 313a: First edge part 313b: Second edge part 32: Can connection part 321: Leg part 322: Extension part BC: Battery cell H: Alignment hole WL1~3: First to third welding lines C: Center line T: Tangent line W: Width G: Spacing

[0054] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0055] Although the terms "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0056] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0057] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0058] Additionally, when it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the components may be directly connected or connected to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through another component.

[0059] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0060] Throughout the specification, when we refer to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when we refer to "C to D", this means C or more and D or less, unless otherwise stated.

[0061] Hereinafter, a preferred embodiment of the present invention will be described with reference to the attached drawings.

[0062] Fig. 6 illustrates a battery cell according to one embodiment. Referring to this, a battery cell (BC) according to one embodiment of the present invention is formed in a cylindrical shape. The battery cell (BC) is manufactured by accommodating an electrode assembly in a battery can (1) made of a conductive material. The electrode assembly has a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are each electrically connected to one of the battery can (1) and a terminal mounted on the battery can (1) and insulated from the battery can (1).

[0063] Fig. 7 illustrates an electrode assembly according to one embodiment. Referring to this, the electrode assembly (2) may have a jelly roll shape in which positive and negative electrode plates are alternately laminated and wound with a separator interposed therebetween. Specifically, the electrode assembly (2) is formed in a cylindrical shape surrounding a hollow portion extending along a central axis.

[0064] A positive electrode active material and a negative electrode active material are applied to the positive electrode plate and the negative electrode plate, respectively. On one axial side of the electrode assembly (2), an end of the positive electrode plate where the active material is not applied is exposed, and on the other axial side, an end of the negative electrode plate where the active material is not applied is exposed. The ends of the positive electrode plate and the negative electrode plate, which are exposed on one and the other axial side, respectively, constitute a tab portion (20). The tab portion (20) can be connected to the battery can (1) or a terminal to electrically connect the electrode assembly (2) to the outside.

[0065] Meanwhile, the tab portion (20) of the electrode assembly (2) is not directly connected to the battery can (1), but can be electrically connected to the battery can (1) through a current collector plate that is welded to the tab portion (20) and connected to the battery can (1).

[0066] Figures 8 and 9 illustrate a current collector plate according to one embodiment. Referring to these drawings, the current collector plate (3) according to one embodiment of the present invention is formed entirely of a conductive material and includes a main body (30), a tab connection portion (31), and a can connection portion (32).

[0067] The main body (30) is formed in a plate shape having a thickness and can be generally formed in a circular shape. A hole corresponding to the hollow portion of the electrode assembly (2) is provided at the center of the main body (30) and can serve as an injection port for an electrolyte that impregnates the electrode assembly (2).

[0068] The above tab connection portion (31) protrudes radially outward from the main body portion (30), and its bottom surface is welded to the tab portion (20) of the electrode assembly (2), thereby connecting the current collector plate (3) to the positive or negative electrode of the electrode assembly (2).

[0069] According to one embodiment of the present invention, in each of the tab connection portions (31), an edge portion (313) is defined, which defines the radially innermost boundary of the tab connection portion (31), and which includes a base portion (311) placed on the outer periphery of the main body portion (30), a first edge portion (313a) defining one width-direction boundary of the tab connection portion (31), and a second edge portion (313b) defining the other width-direction boundary of the tab connection portion (31).

[0070] At this time, the radially outer boundary of the tab connection portion (31) is defined as the tip portion (312). Specifically, the base portion (311) means a portion on an imaginary line connecting both ends where the tab connection portion (31) begins to protrude from the main body portion (30), and the edge portion (313) means a pair of ends connecting both ends of the base portion (311) and the tip portion (312). Accordingly, the tab connection portion (31) is defined as an area surrounded by the edge portion (313), the base portion (311), and the tip portion (312).

[0071] Hereinafter, as well as throughout the specification, the width direction of the tab connection portion (31) means the direction in which the base portion (311) extends, that is, the extension direction of an imaginary straight line passing through two points where the tab connection portion (31) begins to protrude from the main body portion (30) and a direction parallel thereto.

[0072] According to one embodiment, each of the tab connecting portions (31) is provided with one or more alignment holes (H). The alignment holes (H) are provided to align the current collector plate (3) with respect to the electrode assembly (2). Specifically, according to one embodiment, an alignment bar, which is at least temporarily fixed to the electrode assembly (2), passes through the alignment holes (H), and in that state, the current collector plate (3) and the electrode assembly (2) are welded, so that the current collector plate (3) can be welded in a state in which it is properly aligned with the electrode assembly (2).

[0073] It is preferable that three or more of the above tab connecting portions (31) be provided. If two or fewer of the above tab connecting portions (31) are provided, the current collector plate (3) is likely to be twisted or lifted with respect to the alignment bar or the electrode assembly (2), which may cause problems such as deformation, misalignment, or reduced welding strength. Specifically, according to one embodiment of the present invention, a total of four tab connecting portions (31) are provided in all directions.

[0074] According to one embodiment of the present invention, the alignment hole (H) may be provided one at each of the tab connecting portions (31). At this time, it is preferable that the alignment hole (H) be arranged so that its center is located on the widthwise center line (H) that vertically bisects the base portion (311). This is to symmetrically form the rigidity between the first edge portion (313a) and the alignment hole (H) and the rigidity between the second edge portion (313b) and the alignment hole (H), and to secure the average separation distance between both sides as much as possible.

[0075] The can connection portion (32) may protrude radially outward from a portion of the main body portion (30) from which the tab connection portion (31) does not protrude. The can connection portion (32) may include a leg portion (321) that protrudes radially outward from the main body portion (30) and is bent upward, and an extension portion (322) that extends in both directions in the circumferential direction from the radially outer end of the leg portion (321) and is connected to the battery can (1).

[0076] Fig. 10 shows an enlarged cross-section of a battery cell according to one embodiment. Referring to this, the current collector (3) is disposed between one surface of the battery can (1) and one axial end of the electrode assembly (2). At this time, the tab connection portion (31) is welded to one tab portion (20) of the electrode assembly (2), and the can connection portion (32) is mounted to the crimping portion (10) of the battery can (1), thereby electrically connecting the battery can (1) and the electrode assembly (2).

[0077] Figures 11 and 12 show the positional relationship of alignment holes for the main body and tab connection portion of the collector plate according to one embodiment.

[0078] First, referring to FIG. 11, the alignment hole (H) according to one embodiment of the present invention can be spaced apart from each edge portion (313) in the width direction by a predetermined interval (G).

[0079] At this time, the predetermined gap (G) may be more than half the width (W) of the base portion (311). Accordingly, due to the distance from the edge portion (313) to the alignment hole (H), the tab connection portion (31) can easily resist twisting and circumferential bending, and as a result, the entire collector plate (3) can have more correct alignment, higher welding strength, and resistance to deformation. In addition, as the area between the edge portion (313) and the alignment hole (H) is secured larger, the area through which the welding line for welding the collector plate (3) and the electrode assembly (2) to each other can pass increases, and thus the welding strength between the collector plate (3) and the electrode assembly (2) can be further improved.

[0080] Hereinafter, as well as throughout the specification, the angle formed by two straight lines extending in the radial direction is positive, which means that the two straight lines extend so as to become farther apart from each other as they go outward in the radial direction with respect to the base portion (311).

[0081] According to one embodiment of the present invention, each of the tab connecting portions (31) may include a section whose width increases as it goes radially outward. In addition, as shown in FIG. 12, according to one embodiment of the present invention, in each of the tab connecting portions (31), the angle formed by the first edge portion (313a) and the second edge portion (313b) may be 0 degrees or more. Accordingly, the alignment hole (H) may be provided in a portion having a relatively large width in the tab connecting portion (31), and it is easy to secure a distance from the edge portion (313) to the alignment hole (H).

[0082] Referring back to Fig. 11, it is preferable that the width (W) between the tangent line (T) passing through the widthwise center of the base portion (311) and touching the alignment hole (H) and the edge portion (313) does not decrease as it goes outward in the radial direction. In addition, as in Fig. 12, it is preferable that the angle formed by the tangent line (T) passing through the widthwise center of the base portion (311) and touching the alignment hole (H) and the edge portion (313) is 0 degrees or more. Accordingly, the welding line between the collector plate (3) and the electrode assembly (2) can be extended over a region extending from the base portion (311) to between the edge portion (313) and the alignment hole (H).

[0083] [Revised 15.09.2025 under Rule 91] Fig. 13 illustrates a current collector plate connected to an electrode assembly according to one embodiment. Referring to this, the tab portion (20) and the current collector plate (3) are welded along a welding line extending in a straight line.

[0084] At this time, the welding line includes: a first welding line (WL1) extending from the inside of the main body (30) to between the alignment hole (H) and the first edge portion (313a); and a second welding line (WL2) extending from the inside of the main body (30) to between the alignment hole (H) and the second edge portion (313b).

[0085] According to the present invention, as the welding lines (WL1, WL2, WL3) extend from the inside of the main body (30) through the base portion (311) to between the edge portion (313) and the alignment hole (H), the welding strength between the current collector (3) and the electrode assembly (2) can be greatly secured.

[0086] In addition, according to the present invention, since the alignment hole (H) is provided in the tab connection part (31) rather than inside the main body part (30), it is not placed on the current transmission path between the tab connection part (31) and the can connection part (32), so there is an advantage in that the cross-sectional area of ​​the current path is large and the resistance is small.

[0087] The above welding line may additionally include a third welding line (WL3) extending from the inside of the main body (30) to the radially inner side of the alignment hole (H). According to one embodiment of the present invention, in order for the third welding line (WL3) to extend to a sufficient length, it is important that a sufficient radial distance be secured between the alignment hole (H) and the base portion (311).

[0088] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all possible modifications and variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0089] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A current collector that electrically connects the tab portion of the electrode assembly and the battery can. Main body; Two or more tab connecting portions protruding radially outward from the outer periphery of the main body portion and having their bottom surfaces connected to the tab portion, each having one or more alignment holes; and A can connection portion that protrudes radially outward from a portion where the tab connection portion does not protrude on the outer periphery of the main body portion and is bent upward to be connected to the battery can; For each of the above tab connections, The innermost radial boundary of the above tab connection is defined, and the base portion is placed on the outer periphery of the main body portion, and An edge portion is defined, including a first edge portion defining one width-wise boundary of the tab connection portion and a second edge portion defining the other width-wise boundary of the tab connection portion. The above alignment holes are spaced apart from each edge portion by a predetermined distance in the width direction, The above-mentioned predetermined interval is more than half the width of the base portion, and the current collector plate.

2. A current collector plate according to claim 1, wherein three or more tab connecting portions are provided.

3. A collector plate according to claim 1, wherein each of the tab connecting portions includes a section whose width increases as it goes outward in the radial direction.

4. In claim 1, in each of the tab connecting parts, A collector plate in which the angle formed by the first edge portion and the second edge portion is 0 degrees or more.

5. In claim 1, the current collector plate is provided with one alignment hole in each of the tab connecting portions.

6. In claim 5, the current collector plate, wherein the alignment hole is provided on the widthwise center line of the tab connection portion.

7. A collector plate according to claim 1, wherein the width between the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion does not decrease as it goes outward in the radial direction.

8. A collector plate according to claim 1, wherein the angle formed by the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion is 0 degrees or more.

9. Battery can; An electrode assembly accommodated in the battery can and including a tab portion; including a current collector plate electrically connecting the battery can and the tab portion; The above collector plate: Main body; Two or more tab connecting portions protruding radially outward from the outer periphery of the main body portion, the bottom surfaces of which are connected to the tab portion, and each of which is provided with one or more alignment holes; A can connection portion that protrudes radially outward from a portion where the tab connection portion does not protrude on the outer periphery of the main body portion and is bent upward to be connected to the battery can; For each of the above tab connections, The innermost radial boundary of the above tab connection is defined, and the base portion is placed on the outer periphery of the main body portion, and An edge portion is defined, including a first edge portion defining one width-wise boundary of the tab connection portion and a second edge portion defining the other width-wise boundary of the tab connection portion. The above tab portion and the above collector plate are connected along a welding line extending in a straight line, The above welding line: A first welding line extending from the inside of the main body to between the alignment hole and the first edge portion; and A battery cell comprising a second welding line extending from the inside of the main body to between the alignment hole and the second edge portion.

10. A battery cell according to claim 9, wherein the welding line further includes a third welding line extending from the inside of the main body to the radially inner side of the alignment hole.

11. In claim 9, the alignment holes are spaced apart from each edge portion in the width direction by a predetermined distance, The above-mentioned predetermined interval is more than half the width of the base portion, the battery cell.

12. A battery cell according to claim 9, wherein three or more tab connecting portions are provided.

13. A battery cell according to claim 9, wherein each of the tab connecting portions includes a section whose width increases radially outward.

14. In claim 9, in each of the tab connecting parts, A battery cell wherein the angle formed by the first edge portion and the second edge portion is 0 degrees or more.

15. A battery cell according to claim 9, wherein the alignment hole is provided in each of the tab connecting portions.

16. A battery cell according to claim 15, wherein the alignment hole is provided on the widthwise center line of the tab connection portion.

17. A battery cell according to claim 9, wherein the width between the tangent line passing through the widthwise center of the base portion and touching the alignment hole and the edge portion does not decrease as it goes outward in the radial direction.

18. A battery cell according to claim 9, wherein the angle formed by the edge portion and the tangent line passing through the widthwise center of the base portion and touching the alignment hole is 0 degrees or more.

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